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• W2885285497 abstract "Inspiraling and merging binary neutron stars (BNSs) are important sources of both gravitational waves and coincident electromagnetic counterparts. If the BNS total mass is larger than a threshold value, a black hole ensues promptly after merger. Through a statistical study in conjunction with recent LIGO/Virgo constraints on the nuclear equation of state, we estimate that up to $sim 25%$ of BNS mergers may result in prompt collapse. Moreover, we find that most models of the BNS mass function we study here predict that the majority of prompt-collapse BNS mergers have $qgtrsim 0.8$. Prompt-collapse BNS mergers with mass ratio $q gtrsim 0.8$ may not be accompanied by detectable kilonovae or short gamma-ray bursts, because they unbind a negligible amount of mass and form negligibly small accretion disks onto the remnant black hole. We call such BNS mergers orphan. However, recent studies have found that ${10^{41-43}(B_p/10^{12}rm G)^2 erg, s^{-1}}$ electromagnetic signals can be powered by magnetospheric interactions several milliseconds prior to merger. Moreover, the energy stored in the magnetosphere of an orphan BNS merger remnant will be radiated away in ${mathcal O}(1 rm ms)$. Through simulations in full general relativity of BNSs endowed with an initial dipole magnetosphere, we find that the energy in the magnetosphere following black hole formation is $E_B sim 10^{39-41} (B_p/10^{12}rm G)^2$ erg. Radiating $sim 1%$ of $E_B$ in 1 ms, as has been found in previous studies, matches the premerger magnetospheric luminosity. These magnetospheric signals are not beamed, and their duration and power agrees with those of non-repeating fast radio bursts (FRBs). These results combined with our statistical study suggest that a non-repeating FRB may be the most likely electromagnetic counterpart of prompt-collapse BNSs." @default.
• W2885285497 created "2018-08-22" @default.
• W2885285497 creator A5085102646 @default.
• W2885285497 creator A5091409639 @default.
• W2885285497 date "2019-08-01" @default.
• W2885285497 modified "2023-10-08" @default.
• W2885285497 title "Are fast radio bursts the most likely electromagnetic counterpart of neutron star mergers resulting in prompt collapse?" @default.
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